diff --git a/docs/source/methods/tallies.rst b/docs/source/methods/tallies.rst
index fd0812245..65a0989ac 100644
--- a/docs/source/methods/tallies.rst
+++ b/docs/source/methods/tallies.rst
@@ -507,6 +507,6 @@ improve the estimate of the percentile.
 
 .. _Cauchy distribution: http://en.wikipedia.org/wiki/Cauchy_distribution
 
-.. _unpublished rational approximation: http://home.online.no/~pjacklam/notes/invnorm/
+.. _unpublished rational approximation: https://web.archive.org/web/20150926021742/http://home.online.no/~pjacklam/notes/invnorm/
 
 .. _MC21: http://www.osti.gov/bridge/servlets/purl/903083-HT5p1o/903083.pdf